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sounds like you need to update your Techview. Someone prolly flashed it to a newer version say V39 and your Techview hasn't been updated so you can't talk to it. Also Techview has to be relicensed every 45 days now.

what is your comm loss, chiller to BAS or device on chiller?

It's hard to stop a Trane.but I have made one helluva living keeping them going.